The disinfection method that leaves no residual effect in water is:
A. Ozonation
B. Chlorination
C. Chloramine treatment
D. Bleaching powder
Answer: Option A
Solution (By JKSSB Mock Tests)
Ozone decomposes quickly to O₂, leaving no residual disinfectant. Thus a small chlorine dose may be added after ozonation for distribution protection. Chlorine provides residual protection.
Explanation:
Sodium reacts vigorously with moisture and oxygen in air, so it is stored under kerosene to prevent contact. Potassium, lithium are similarly stored. Iron, zinc, copper do not require such storage.
Explanation:
Chemical bonds are attractive forces between atoms due to electron interaction—ionic (transfer), covalent (sharing), metallic, etc. These bonds hold atoms together in molecules or crystals. Nuclear force holds protons and neutrons in nucleus. Gravitational and magnetic forces are negligible at atomic scale. Bond energy determines stability; stronger bond means more energy required to break.
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